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1 /* Fold a constant sub-tree into a single node for C-compiler
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2 Copyright (C) 1987-2020 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef GCC_FOLD_CONST_H
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21 #define GCC_FOLD_CONST_H
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22
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23 /* Non-zero if we are folding constants inside an initializer; zero
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24 otherwise. */
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25 extern int folding_initializer;
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26
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27 /* Convert between trees and native memory representation. */
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28 extern int native_encode_expr (const_tree, unsigned char *, int, int off = -1);
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29 extern int native_encode_initializer (tree, unsigned char *, int,
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30 int off = -1);
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31 extern tree native_interpret_expr (tree, const unsigned char *, int);
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32 extern bool can_native_interpret_type_p (tree);
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33
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34 /* Fold constants as much as possible in an expression.
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35 Returns the simplified expression.
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36 Acts only on the top level of the expression;
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37 if the argument itself cannot be simplified, its
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38 subexpressions are not changed. */
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39
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40 extern tree fold (tree);
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41 #define fold_unary(CODE,T1,T2)\
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42 fold_unary_loc (UNKNOWN_LOCATION, CODE, T1, T2)
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43 extern tree fold_unary_loc (location_t, enum tree_code, tree, tree);
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44 #define fold_unary_ignore_overflow(CODE,T1,T2)\
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45 fold_unary_ignore_overflow_loc (UNKNOWN_LOCATION, CODE, T1, T2)
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46 extern tree fold_unary_ignore_overflow_loc (location_t, enum tree_code, tree, tree);
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47 #define fold_binary(CODE,T1,T2,T3)\
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48 fold_binary_loc (UNKNOWN_LOCATION, CODE, T1, T2, T3)
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49 extern tree fold_binary_loc (location_t, enum tree_code, tree, tree, tree);
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50 #define fold_ternary(CODE,T1,T2,T3,T4)\
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51 fold_ternary_loc (UNKNOWN_LOCATION, CODE, T1, T2, T3, T4)
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52 extern tree fold_ternary_loc (location_t, enum tree_code, tree, tree, tree, tree);
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53 #define fold_build1(c,t1,t2)\
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54 fold_build1_loc (UNKNOWN_LOCATION, c, t1, t2 MEM_STAT_INFO)
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55 extern tree fold_build1_loc (location_t, enum tree_code, tree,
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56 tree CXX_MEM_STAT_INFO);
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57 #define fold_build2(c,t1,t2,t3)\
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58 fold_build2_loc (UNKNOWN_LOCATION, c, t1, t2, t3 MEM_STAT_INFO)
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59 extern tree fold_build2_loc (location_t, enum tree_code, tree, tree,
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60 tree CXX_MEM_STAT_INFO);
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61 #define fold_build3(c,t1,t2,t3,t4)\
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62 fold_build3_loc (UNKNOWN_LOCATION, c, t1, t2, t3, t4 MEM_STAT_INFO)
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63 extern tree fold_build3_loc (location_t, enum tree_code, tree, tree, tree,
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64 tree CXX_MEM_STAT_INFO);
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65 extern tree fold_build1_initializer_loc (location_t, enum tree_code, tree, tree);
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66 extern tree fold_build2_initializer_loc (location_t, enum tree_code, tree, tree, tree);
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67 #define fold_build_call_array(T1,T2,N,T4)\
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68 fold_build_call_array_loc (UNKNOWN_LOCATION, T1, T2, N, T4)
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69 extern tree fold_build_call_array_loc (location_t, tree, tree, int, tree *);
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70 #define fold_build_call_array_initializer(T1,T2,N,T4)\
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71 fold_build_call_array_initializer_loc (UNKNOWN_LOCATION, T1, T2, N, T4)
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72 extern tree fold_build_call_array_initializer_loc (location_t, tree, tree, int, tree *);
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73 extern tree get_array_ctor_element_at_index (tree, offset_int,
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74 unsigned * = NULL);
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75 extern bool fold_convertible_p (const_tree, const_tree);
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76 #define fold_convert(T1,T2)\
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77 fold_convert_loc (UNKNOWN_LOCATION, T1, T2)
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78 extern tree fold_convert_loc (location_t, tree, tree);
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79 extern tree fold_single_bit_test (location_t, enum tree_code, tree, tree, tree);
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80 extern tree fold_ignored_result (tree);
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81 extern tree fold_abs_const (tree, tree);
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82 extern tree fold_indirect_ref_1 (location_t, tree, tree);
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83 extern void fold_defer_overflow_warnings (void);
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84 extern void fold_undefer_overflow_warnings (bool, const gimple *, int);
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85 extern void fold_undefer_and_ignore_overflow_warnings (void);
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86 extern bool fold_deferring_overflow_warnings_p (void);
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87 extern void fold_overflow_warning (const char*, enum warn_strict_overflow_code);
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88 extern enum tree_code fold_div_compare (enum tree_code, tree, tree,
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89 tree *, tree *, bool *);
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90 extern bool operand_equal_p (const_tree, const_tree, unsigned int flags = 0);
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91 extern int multiple_of_p (tree, const_tree, const_tree);
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92 #define omit_one_operand(T1,T2,T3)\
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93 omit_one_operand_loc (UNKNOWN_LOCATION, T1, T2, T3)
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94 extern tree omit_one_operand_loc (location_t, tree, tree, tree);
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95 #define omit_two_operands(T1,T2,T3,T4)\
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96 omit_two_operands_loc (UNKNOWN_LOCATION, T1, T2, T3, T4)
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97 extern tree omit_two_operands_loc (location_t, tree, tree, tree, tree);
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98 #define invert_truthvalue(T)\
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99 invert_truthvalue_loc (UNKNOWN_LOCATION, T)
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100 extern tree invert_truthvalue_loc (location_t, tree);
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101 extern tree fold_unary_to_constant (enum tree_code, tree, tree);
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102 extern tree fold_binary_to_constant (enum tree_code, tree, tree, tree);
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103 extern tree fold_bit_and_mask (tree, tree, enum tree_code,
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104 tree, enum tree_code, tree, tree,
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105 tree, enum tree_code, tree, tree, tree *);
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106 extern tree fold_read_from_constant_string (tree);
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107 extern tree fold_read_from_vector (tree, poly_uint64);
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108 #if GCC_VEC_PERN_INDICES_H
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109 extern tree fold_vec_perm (tree, tree, tree, const vec_perm_indices &);
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110 #endif
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131
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111 extern bool wide_int_binop (wide_int &res, enum tree_code,
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112 const wide_int &arg1, const wide_int &arg2,
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113 signop, wi::overflow_type *);
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114 extern tree int_const_binop (enum tree_code, const_tree, const_tree, int = 1);
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115 #define build_fold_addr_expr(T)\
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116 build_fold_addr_expr_loc (UNKNOWN_LOCATION, (T))
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117 extern tree build_fold_addr_expr_loc (location_t, tree);
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118 #define build_fold_addr_expr_with_type(T,TYPE)\
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119 build_fold_addr_expr_with_type_loc (UNKNOWN_LOCATION, (T), TYPE)
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120 extern tree build_fold_addr_expr_with_type_loc (location_t, tree, tree);
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121 extern tree fold_build_cleanup_point_expr (tree type, tree expr);
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122 #define build_fold_indirect_ref(T)\
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123 build_fold_indirect_ref_loc (UNKNOWN_LOCATION, T)
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124 extern tree build_fold_indirect_ref_loc (location_t, tree);
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125 #define fold_indirect_ref(T)\
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126 fold_indirect_ref_loc (UNKNOWN_LOCATION, T)
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127 extern tree fold_indirect_ref_loc (location_t, tree);
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128 extern tree build_simple_mem_ref_loc (location_t, tree);
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129 #define build_simple_mem_ref(T)\
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130 build_simple_mem_ref_loc (UNKNOWN_LOCATION, T)
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131
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131 extern poly_offset_int mem_ref_offset (const_tree);
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132 extern tree build_invariant_address (tree, tree, poly_int64);
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133 extern tree constant_boolean_node (bool, tree);
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134 extern tree div_if_zero_remainder (const_tree, const_tree);
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135
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136 extern bool tree_swap_operands_p (const_tree, const_tree);
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137 extern enum tree_code swap_tree_comparison (enum tree_code);
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138
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139 extern bool ptr_difference_const (tree, tree, poly_int64_pod *);
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140 extern enum tree_code invert_tree_comparison (enum tree_code, bool);
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131
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141 extern bool inverse_conditions_p (const_tree, const_tree);
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142
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143 extern bool tree_unary_nonzero_warnv_p (enum tree_code, tree, tree, bool *);
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144 extern bool tree_binary_nonzero_warnv_p (enum tree_code, tree, tree, tree op1,
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145 bool *);
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146 extern bool tree_single_nonzero_warnv_p (tree, bool *);
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147 extern bool tree_unary_nonnegative_warnv_p (enum tree_code, tree, tree,
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148 bool *, int);
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149 extern bool tree_binary_nonnegative_warnv_p (enum tree_code, tree, tree, tree,
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150 bool *, int);
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151 extern bool tree_single_nonnegative_warnv_p (tree, bool *, int);
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152 extern bool tree_call_nonnegative_warnv_p (tree, combined_fn, tree, tree,
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153 bool *, int);
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154
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155 extern bool integer_valued_real_unary_p (tree_code, tree, int);
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156 extern bool integer_valued_real_binary_p (tree_code, tree, tree, int);
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157 extern bool integer_valued_real_call_p (combined_fn, tree, tree, int);
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158 extern bool integer_valued_real_single_p (tree, int);
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159 extern bool integer_valued_real_p (tree, int = 0);
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160
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161 extern bool fold_real_zero_addition_p (const_tree, const_tree, int);
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162 extern tree combine_comparisons (location_t, enum tree_code, enum tree_code,
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163 enum tree_code, tree, tree, tree);
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164 extern void debug_fold_checksum (const_tree);
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165 extern bool may_negate_without_overflow_p (const_tree);
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166 #define round_up(T,N) round_up_loc (UNKNOWN_LOCATION, T, N)
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167 extern tree round_up_loc (location_t, tree, unsigned int);
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168 #define round_down(T,N) round_down_loc (UNKNOWN_LOCATION, T, N)
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169 extern tree round_down_loc (location_t, tree, int);
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170 extern tree size_int_kind (poly_int64, enum size_type_kind);
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171 #define size_binop(CODE,T1,T2)\
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172 size_binop_loc (UNKNOWN_LOCATION, CODE, T1, T2)
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173 extern tree size_binop_loc (location_t, enum tree_code, tree, tree);
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174 #define size_diffop(T1,T2)\
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175 size_diffop_loc (UNKNOWN_LOCATION, T1, T2)
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176 extern tree size_diffop_loc (location_t, tree, tree);
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177
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178 /* Return an expr equal to X but certainly not valid as an lvalue. */
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179 #define non_lvalue(T) non_lvalue_loc (UNKNOWN_LOCATION, T)
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180 extern tree non_lvalue_loc (location_t, tree);
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181
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182 extern bool tree_expr_nonzero_p (tree);
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183 extern bool tree_expr_nonnegative_p (tree);
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184 extern bool tree_expr_nonnegative_warnv_p (tree, bool *, int = 0);
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185 extern tree make_range (tree, int *, tree *, tree *, bool *);
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186 extern tree make_range_step (location_t, enum tree_code, tree, tree, tree,
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187 tree *, tree *, int *, bool *);
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188 extern tree range_check_type (tree);
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189 extern tree build_range_check (location_t, tree, tree, int, tree, tree);
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190 extern bool merge_ranges (int *, tree *, tree *, int, tree, tree, int,
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191 tree, tree);
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192 extern tree sign_bit_p (tree, const_tree);
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193 extern tree exact_inverse (tree, tree);
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194 extern bool expr_not_equal_to (tree t, const wide_int &);
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195 extern tree const_unop (enum tree_code, tree, tree);
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196 extern tree const_binop (enum tree_code, tree, tree, tree);
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197 extern bool negate_mathfn_p (combined_fn);
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198 extern const char *c_getstr (tree, unsigned HOST_WIDE_INT * = NULL);
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199 extern wide_int tree_nonzero_bits (const_tree);
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200
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201 /* Return OFF converted to a pointer offset type suitable as offset for
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202 POINTER_PLUS_EXPR. Use location LOC for this conversion. */
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203 extern tree convert_to_ptrofftype_loc (location_t loc, tree off);
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204
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205 #define convert_to_ptrofftype(t) convert_to_ptrofftype_loc (UNKNOWN_LOCATION, t)
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206
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207 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
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208 extern tree fold_build_pointer_plus_loc (location_t loc, tree ptr, tree off);
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209
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210 #define fold_build_pointer_plus(p,o) \
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211 fold_build_pointer_plus_loc (UNKNOWN_LOCATION, p, o)
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212
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213 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
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214 extern tree fold_build_pointer_plus_hwi_loc (location_t loc, tree ptr, HOST_WIDE_INT off);
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215
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216 #define fold_build_pointer_plus_hwi(p,o) \
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217 fold_build_pointer_plus_hwi_loc (UNKNOWN_LOCATION, p, o)
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218
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219
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220 /* Class used to compare gimple operands. */
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221
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222 class operand_compare
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223 {
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224 public:
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225 /* Return true if two operands are equal. The flags fields can be used
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226 to specify OEP flags described above. */
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227 virtual bool operand_equal_p (const_tree, const_tree, unsigned int flags);
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228
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229 /* Generate a hash value for an expression. This can be used iteratively
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230 by passing a previous result as the HSTATE argument. */
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231 virtual void hash_operand (const_tree, inchash::hash &, unsigned flags);
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232
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233 protected:
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234 /* Verify that when arguments (ARG0 and ARG1) are equal, then they have
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235 an equal hash value. When the function knowns comparison return,
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236 true is returned. Then RET is set to corresponding comparsion result. */
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237 bool verify_hash_value (const_tree arg0, const_tree arg1, unsigned int flags,
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238 bool *ret);
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239 };
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240
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241 #endif // GCC_FOLD_CONST_H
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